JP3548907B2

JP3548907B2 - Intermediate branch connection method for optical fiber cable

Info

Publication number: JP3548907B2
Application number: JP2000078639A
Authority: JP
Inventors: 成根呉; 源録金; 元 ▲チョル▼ 姜
Original assignee: 韓國電氣通信公社
Priority date: 2000-03-21
Filing date: 2000-03-21
Publication date: 2004-08-04
Anticipated expiration: 2020-03-21
Also published as: JP2001272549A

Description

【０００１】
【発明が属する技術分野】
本発明は、光線路線網の構成でループ配線型やスター配線型が適用された光ファイバケーブル区間の中間地点で小心のケーブルを分岐するための光ファイバケーブルの中間分岐接続方法に関し、特に分岐地点で被分岐心線のみを引き出すために中間分岐接続部と中間分岐補助接続部とを具現して、被分岐ケーブルの接続余長を別途に確保していない状態で中間分岐接続を行えるようにする光ファイバケーブルの中間分岐接続方法に関する。
【０００２】
【従来の技術】
一般に、光線路網は、サービスの多様化及びサービスの量的変化に対する適応性、設備の信頼性、経済性などを考慮してループ配線型、スター配線型などの形態により構成され、上記ループ配線型は、図１ａに示すように、ケーブル新設の時、分岐が予想される溝や電柱１、２、３、４、５、６上に分岐接続のためのケーブル余長を事前に確保し、運用中に心線需要が発生すれば、心線需要が発生された地点からループ配線網の分岐点まで分岐ケーブルを設置し、ループ配線網により構成された被分岐ケーブル内の被分岐光ファイバ心線（以下、”被分岐心線”という）のみを分岐ケーブルの分岐光ファイバ心線（以下、”分岐心線”という）と左、右方向に接続することによってループ形態の光線路網を構築する。
【０００３】
そして、スター配線型も、図１ｂに示すように、光ファイバケーブル新設の時、分岐予想地点を選定した後、分岐接続のための光ケーブルの接続余長を確保して溝や電柱１、２、３、４上に固定し、運用中に心線需要が発生すれば、心線需要が発生された地点からスター配線網の分岐点まで分岐ケーブルを設置し、スター網により構成された被分岐ケーブル内の被分岐心線のみを分岐心線と接続させることによってスター形態の光線路網を構築する。
【０００４】
上記のような光線路網の構築において、心線需要が発生された地点への分岐は、各線路網を構成するケーブルの接続地点で分岐して接続する接続点分岐接続、接続地点ではないケーブルの中間地点で分岐して接続する中間分岐接続がある。
【０００５】
一方、上記光ファイバ心線間の相互接続の時、光ファイバ接続部に張力が直接加わらなくて、接続の失敗、または故障、または運用上の必要による再接続の要求に応じ、接続部から接続装置までの距離を確保するために最小限の光ファイバ心線の長さを確保すべきであるため、上記中間分岐接続では、分岐接続のための接続余長を確保すべきである。
【０００６】
上記のように、接続余長を必要とする従来技術による光ファイバケーブルの中間分岐接続方法では、図２ａに示すように、中間分岐接続位置にある溝ａ内の管路１０から被分岐光ファイバケーブル２０を引っ張り出してケーブル支持台３０に支持させた後、ループ部を作って余長を確保する。この場合、上記溝ａには被分岐光ファイバケーブル２０の心線と連結される分岐光ファイバケーブル４０が位置される。そして、図２ｂに示すように、接続余長のケーブルをケーブル支持部３０ａに固定させ、上記ループ部の両側に外皮剥ぎ取り地点を表示した後、光ファイバ心線が引き出されるように上記外皮剥ぎ取り地点内にあるケーブルの外皮を除去することによって中間分岐接続部ｃを形成する。上記外皮が除去された部分には接続ボックスが装着される。
【０００７】
一方、中間分岐接続の需要が発生した溝内でケーブルの余長を確保することができなかったりケーブルの余長が確保されない場合には、図３のように分岐ケーブル４０を中間分岐接続溝ａ附近の接続点分岐溝ｂまで布設し、接続部５０を解体して上記分岐ケーブル４０を被分岐ケーブル２０と分岐させる接続点分岐接続を遂行する。この場合、接続点分岐のためには最大５００ｍ程度までの分岐光ファイバケーブルが追加されなければならない。
【０００８】
しかし、上記のような従来の光ファイバケーブルの中間分岐接続方法では、光線路網の効率的な構築のための光ケーブル施設の経済性、運用性、作業性などの側面から次のような種々の問題点が発生した。
【０００９】
第１に、光ケーブルの新設の時、作業者が分岐予想地点を正確に選定出来なくてケーブルの余長が過多に確保されるか、中間分岐接続のために確保されたケーブルの余長が足りなくなってループまたはスター配線区間のケーブル接続点まで分岐ケーブルを布設すべきであるため、追加されるケーブルによって費用が過多に費やされる。
【００１０】
第２に、作業者が分岐予想地点を不正確に選定する場合、光線路区間に確保された余長を解いて中間分岐が発生された地点まで引っ張り出すか、分岐ケーブルを分岐接続余長が確保された所まで布設すべきであるため、布設にともなう費用が追加される。
【００１１】
第３に、中間分岐が発生された地点で、確保された接続余長は、未分岐心線が接続ボックス内に収容されることのできる長さに合わせるべきであるため、作業性が低い。
【００１２】
第４に、確保された接続余長の長さほど中間分岐接続部で未分岐心線を切断しなくて被分岐心線のみを切断することができるようにケーブルの外皮を横方向、及び縦方向に切断して除去すべきであるため、作業に相当な時間が必要となる。
【００１３】
第５に、硬質のＰＢＴＰ（ＰｏｌｙｂｕｔａｄｉｅｎｅＴｅｒｅｐｈｔｈａｌａｔｅ：ポリブタジエンテレフタレート）を利用して未分岐心線が収容された光ファイバ心線ユニットを接続ボックス内で許容屈曲半径以上に維持すべきであるため、上記光ファイバ心線ユニットを接続ボックス内で整頓することは困難であって、これによって運用中の光ファイバ心線が収容された未分岐ユニット内の光ファイバ心線に対する信頼度を低下させることになる。
【００１４】
第６に、溝内に確保された接続余長により溝内部が相当に複雑になり、電柱上に確保された接続余長は美観を損なうだけでなく、ケーブルの信頼度を低下させる。
【００１５】
【発明が解決しようとする課題】
したがって、本発明は、上記した問題点を解決するため、提案されたものであって、中間分岐接続の時、ループ部を有しない一直線状態のケーブル（ケーブルの余長を持たせていない状態を意味する）においても被分岐心線の接続余裕を提供する光ファイバケーブルの中間分岐接続方法を提供するにその目的がある。
【００１６】
【課題を解決するための手段】
上記した目的を達成するため、本発明は、余長を持たせていない一直線上の被分岐光ファイバケーブルに分岐ケーブルを接続するための方法において、上記被分岐ケーブルで一定間隔をおいて所定長さの外皮を各々除去して第１外皮維持部両側に第１分岐接続部と第１補助接続部を形成する第１ステップと、上記第１分岐接続部で被分岐心線を切断して第１被分岐心線と第２被分岐心線とを形成する第２ステップと、上記分岐接続部で第１被分岐心線と第１分岐心線とを連結して連結部を形成する第３ステップと、上記連結部を補助接続部側に引出す第４ステップと、上記補助接続部で第１被分岐心線を分岐ケーブルの第１分岐心線と接続させ、上記分岐接続部で第２被分岐心線を分岐ケーブルの第２分岐心線と接続させる第５ステップとを含む光ファイバケーブルの中間分岐接続方法を提供する。
【００１７】
また、本発明は、余長を持たせていない一直線上の被分岐光ファイバケーブルに分岐ケーブルを接続するための方法において、上記被分岐ケーブルで一定の間隔をおいて所定の長さの外皮を各々除去して第１外皮維持部両側に第１分岐接続部と第１補助接続部とを形成する第１ステップと、上記第１分岐接続部で被分岐心線を切断して第１被分岐心線と第２被分岐心線とを形成する第２ステップと、上記被分岐ケーブルの第１外皮維持部から上記第１補助接続部側の方向に第１被分岐心線を引き出す第３ステップと、上記補助接続部側に所定の長さの中空体を設置する第４ステップと、上記分岐ケーブルの分岐心線を上記中空体に貫通させて上記補助接続部側に位置させる第５ステップと、上記被分岐ケーブルの第１分岐接続部で第２被分岐心線と記第５ステップで上記中空体に貫通されなかった分岐心線を連結する第６ステップと、上記被分岐ケーブルの第１補助接続部で第１被分岐心線と、上記第５ステップで上記中空体に貫通された分岐光ファイバ心線を連結する第７ステップとを含む光ファイバケーブルの中間分岐接続方法をさらに提供する。
【００１８】
また、本発明は、余長を持たせていない被分岐光ファイバケーブルに分岐ケーブルを接続するための方法において、上記被分岐ケーブルで一定の間隔をおいて所定長さの外皮を各々除去して第１外皮維持部両側に第１分岐接続部と第１補助接続部を形成する第１ステップと、上記第１分岐接続部で被分岐心線を切断して第１被分岐心線と第２被分岐心線とを形成する第２ステップと、上記被分岐ケーブルの第１外皮維持部から上記第１補助接続部側の方向に第１被分岐心線を引き出す第３ステップと、上記分岐ケーブルの先端を上記被分岐ケーブルの第１補助接続部上に位置されるように整列させ、上記第１分岐接続部及び上記第１補助接続部に相応する位置の分岐ケーブル外皮を除去して第２外皮維持部の両側に第２分岐接続部及び第２補助接続部を形成する第４ステップと、上記分岐ケーブルの第２外皮維持部から上記第２分岐接続部側の方向に分岐心線を引き出す第５ステップと、上記被分岐ケーブルの第２被分岐心線と上記第４ステップで引出された分岐心線とを連結する第６ステップと、上記第１被分岐心線と上記分岐ケーブルの第２補助接続部側の分岐光ファイバ心線とを連結する第７ステップとを含む光ファイバケーブルの中間分岐接続方法を提供する。
【００１９】
以下、添付された図面を参照し本発明に係る光ファイバケーブルの中間分岐接続方法について詳細に説明する。尚、本発明の構成要素の中、従来技術の構成要素と同一の部分に対しては同一の図面番号を付した。
【００２０】
まず、本発明では、図４及び図５に示すように、中間分岐接続点溝ａ内の管路１０に引き入れられた被分岐ケーブル２０をケーブル支持台３０のケーブル支持部３０ａに固定させた後、一直線上となった被分岐ケーブル２０の中間地点で分岐接続する長さほど第１分岐接続部ｅの外皮を除去し、上記第１分岐接続部ｅの片側には補助接続のための第１補助接続部ｆを備え、上記第１補助接続部ｆでは補助接続ボックスの長さほど外皮を長さほど除去する。このように、第１分岐接続部ｅと第１補助接続部ｆとで外皮を除去するステップは、以下で説明する全ての実施例で共通的に含まれるステップとなる。
【００２１】
ここで、第１分岐接続部ｅ及び第１補助接続部ｆの長さは、これらの接続部を収容する分岐接続ボックス及び補助接続ボックスの長さより長くないようにすることは当然であり、また第１分岐接続部ｅ及び第１補助接続部ｆ間の距離は、被分岐ケーブル２０が引き入れられている中間分岐接続点溝ａ内の空間に制約を受けることになる。第１補助接続部ｆの長さは、約２５ｃｍ〜約３０ｃｍ、第１分岐接続部ｅの長さは、約５０ｃｍ〜約６０ｃｍが好適であり、また第１分岐接続部ｅ及び第１補助接続部ｆ間の距離は、約２５ｃｍ〜約３０ｃｍが最も好適である。
【００２２】
本発明の第１実施例では、分岐ケーブルの分岐心線を第１分岐接続部で第１補助接続部に送る方法を使用してループ配線法の中間分岐接続を可能とするべく、まず、図６ａに示すように、第１分岐接続部ｅと上記第１分岐接続部ｅの片側区間に形成された第１補助接続部ｆでそれぞれの接続ボックスに該当する長さほどの外皮を剥ぎ取る。ここで、第１補助接続部ｆの長さは、約２５ｃｍ〜約３０ｃｍ、第１分岐接続部ｅの長さは、約５０ｃｍ〜約６０ｃｍが好適であり、また第１分岐接続部ｅ及び第１補助接続部ｆ間の距離は、約２５ｃｍ〜約３０ｃｍが最も好適であることは上述したとおりである。そして、第１分岐接続部ｅの被分岐光ファイバ心線ユニット（以下、”被分岐ユニット”という）２０ａの心線の中から所定部分を切断する。この場合、上記切断された部分は、被分岐心線６０であり、その残りの部分は、未分岐心線７０となる。
【００２３】
これによって、図６ｂのように、上記被分岐心線６０は、補助接続部側の第１被分岐心線６０ａと、上記第１補助接続部の反対側に位置された第２被分岐心線６０ｂとに分けられる。ここで、作業者は、第１分岐接続部側に位置されている分岐ケーブル４０から第１分岐心線及び第２分岐心線４０ａ、４０ｂによりなる分岐心線を引き出した後、上記第１被分岐心線６０ａと第１分岐心線４０ａとを連結して臨時連結部ｇを形成する。
【００２４】
次いで、第１補助接続部側から第１被分岐心線６０ａを引っ張り出すと、第１被分岐心線６０ａと第１分岐心線４０ａ及び臨時連結部ｇは、第１分岐接続部側から補助接続部側に引き出され、第１分岐心線４０ａが補助接続部側に引き出された状態で上記臨時連結部ｇは解体される（図６ｃ及び図７ａ参照）。
【００２５】
次いで、作業者は第１分岐接続部及び第１補助接続部で被分岐ユニット２０ａの未分岐心線７０をユニットらせん（スパイラルチューブ）８０で被せて保護し（図７ｂ参照）、第１分岐接続部と第１補助接続部に該当光ファイバ心線保護支持板、すなわちトレー１１、１２を各々取り付けた後、第１分岐接続部のレー１１内で第２被分岐心線６０ｂ、第２分岐心線４０ｂ及び余分の第１分岐心線４０ａを体積が小さくなるように巻いて整理し、第１補助接続部のトレー１２内では第１被分岐心線６０ａ及び第１分岐心線４０ａを巻いて整理する（図７ｃ参照）。
【００２６】
この場合、第１分岐接続部及び第１補助接続部では、図８ａに示すように、それぞれの接続ボックス１３、１４に被分岐ケーブル２０及び分岐ケーブル４０を結合することによって、接続余長を追加に確保しなくても容易に中間分岐接続を実施することができる。
【００２７】
さらに、図８ｂのように、光ファイバ心線ユニット単位で分岐する場合には、外皮切断地点間の被分岐ユニット２０ａ間に未分岐心線が残っていないため、ユニットらせん８０による未分岐心線の保護作業なしに第１分岐接続部で切断された第１被分岐心線６０ａと第１分岐心線４０ａを臨時に連結して臨時連結部を形成した後、第１補助接続部側で第１被分岐心線６０ａを引っ張り出すことによって、第１分岐接続部の第１分岐心線４０ａは、被分岐ユニット２０ａを介して第１補助接続部に引き出すことができる。上記のような光ファイバ心線ユニット単位分岐での第１分岐接続部及び第１補助接続部のトレー１１、１２内には、図８ｃのように、第１及び第２被分岐心線６０ａ、６０ｂと第１及び第２分岐心線４０ａ、４０ｂが整理される。
【００２８】
上記した方法で中間分岐を行った後、中間分岐接続点を溝や電柱中に設けることになるが、これは図９に示すように、第１分岐接続部と第１補助接続部との間に被分岐ケーブル２０のユニット２０ａを活用した分岐心線連結方法による中間分岐接続を遂行した結果として中間分岐接続ボックス１３と補助接続ボックス１４が被分岐ケーブル２０と一直線上にあることになり、分岐ケーブル４０は、中間分岐接続ボックス１３内に収容される。
【００２９】
一方、本発明の第２実施例では、第１分岐接続部で被分岐ユニットを活用して分岐心線を第１補助接続部に送ることが困難である場合、図１０ａ〜図１２ｂに示すように、別途のチューブケーブルを利用して第１分岐接続部と第１補助接続部とを連結することによって、分岐心線を容易に第１補助接続部に設置することができるようにした。
【００３０】
本実施例では、まず、図１０ａに示すように、第１分岐接続部ｅと第１補助接続部ｆとでそれぞれの接続ボックスに該当する長さほどの外皮を除去し、第１分岐接続部ｅの被分岐ユニット２０ａから所定部分を切断する。ここで、第１補助接続部ｆの長さは、約２５ｃｍ〜約３０ｃｍ、第１分岐接続部ｅの長さは、約５０ｃｍ〜約６０ｃｍが好適であり、また第１分岐接続部ｅ及び第１補助接続部ｆ間の距離は、約２５ｃｍ〜約３０ｃｍが最も好適であることは上述のとおりである。また、上記切断された部分は、被分岐心線６０であり、切断されなくて残っている部分は、未分岐心線７０である。そして、上記被分岐心線６０は、第１補助接続部ｆ側の第１被分岐心線６０ａと、第１分岐接続部ｅ側の第２被分岐心線（６０ｂ）とに分けられる。
【００３１】
次いで、第１分岐接続部ｅの片側に位置された分岐ケーブル４０から第１及び第２分岐心線４０ａ、４０ｂからなる分岐心線を引き出した後、第１分岐接続部ｅと第１補助接続部ｆとの間に所定長さのチューブケーブル１５を設ける（図１０ｂ参照）。
【００３２】
次いで、作業者は、図１１ａに示すように、第１補助接続部ｆ側に第１被分岐心線６０ａを引っ張り出して上記第１被分岐心線６０ａが第１補助接続部ｆ側に位置されるようにした後、上記分岐ケーブル４０の第１分岐心線４０ａをユニットらせん８０で保護してチューブケーブル１５内に引き入れることによってその端部が第１補助接続部側に位置されるようにする。そして、上記被分岐ユニット２０ａ内の未分岐心線は、ユニットらせん８０で被せて保護し、上記第２分岐心線４０ｂの所定部位は、保護チューブ１０で被せて保護する。
【００３３】
次いで、上記第１分岐接続部と第１補助接続部とにトレー１１、１２を各々取り付け、第１分岐接続部のトレー１１内には、第２被分岐心線６０ｂ及び第２分岐心線４０ｂを巻いて整理し、第１補助接続部のトレー１２内には、第１被分岐心線６０ａ及びチューブケーブル１５から引き入れられた第１分岐心線４０ａを巻いて整理する（図１１ｂ参照）。これによって、第１分岐接続部及び第１補助接続部でそれぞれの接続ボックス１３、１４を利用して被分岐ケーブル２０、分岐ケーブル４０、チューブケーブル１５を結合することによって、被分岐ケーブル２０の接続余長を追加に確保しなくても容易に中間分岐接続を可能とする（図１１ｃ参照）。
【００３４】
さらに、本実施例で光ファイバ心線ユニット単位に分岐する場合には、図１２ａに示すように、外皮剥ぎ取り地点間の被分岐ユニット２０ａの間に未分岐心線が残っていないので、ユニットらせんによる未分岐心線の保護作業なしに第１被分岐心線６０ａ全部を引っ張り出して補助接続部側に引き出し、第１分岐接続部側の分岐ケーブル４０では、第１分岐心線４０ａ全部をユニットらせん８０で被せて保護した状態でチューブケーブル１５内に引き入れて補助接続部側に送ることになる。この場合、第１及び第２被分岐心線６０ａ、６０ｂ及び分岐心線４０ａ、４０ｂは、図１２ｂのように、光ファイバ心線ユニット単位分岐での第１分岐接続部及び第１補助接続部のトレー１１、１２内に整理される。
【００３５】
上記のように第１分岐接続部と第１補助接続部との間にチューブケーブルを活用した分岐心線連結方法による中間分岐接続を遂行した場合には、図１３に示すように、中間分岐接続ボックス１３と補助接続ボックス１４とが被分岐ケーブル２０と一直線上にあることになり、分岐ケーブル４０は、中間分岐接続ボックス１３内に収容されることになり、中間分岐接続ボックス１３と補助接続ボックス１４との間には被分岐ケーブル２０及びチューブケーブル１５により連結される。
【００３６】
図１４ａ〜図１６ｂは、本発明に係る光ファイバケーブルの中間分岐接続方法の第３実施例を説明するための図面として、図面に示すように、上記第２実施例のチューブケーブル１５を利用する中間分岐接続方法とは異なり、別途のチューブケーブル１５を用意しなくて、分岐ケーブル４０の片側の外皮を除去して被分岐ケーブル２０の第１分岐接続部ｅ及び第１補助接続部ｆを連結することによって、分岐心線を容易に補助接続部ｆに設置することができるようにした。
【００３７】
以下では、説明の便宜のため、分岐ケーブル４０に形成される分岐接続部及び補助接続部を各々第２分岐接続部及び第２補助接続部として定義し、被分岐ケーブル２０に形成される分岐接続部及び補助接続部を先に定義したように、各々第１分岐接続部及び第１補助接続部として定義する。
【００３８】
本実施例では、まず図１４ａに示すように、被分岐ケーブル２０の第１分岐接続部ｅと第１補助接続部ｆでそれぞれの接続ボックスに該当する長さほどの外皮を除去し、第１分岐接続部ｅの被分岐ユニット２０ａから所定部分を切断する。ここで、第１補助接続部ｆの長さは、約２５ｃｍ〜約３０ｃｍ、第１分岐接続部ｅの長さは、約５０ｃｍ〜約６０ｃｍが好適であり、また第１分岐接続部ｅ及び第１補助接続部ｆとの間の距離は、約２５ｃｍ〜約３０ｃｍが最も好適であることは上記した通りである。また上記切断された部分は、被分岐心線６０であり、切断されなくて残っている部分は、未分岐心線７０である。そして、上記被分岐心線６０は、第１補助接続部ｆ側の第１被分岐心線６０ａと、第１分岐接続部ｅ側の第２被分岐心線６０ｂとで分かれる。
【００３９】
一方、分岐ケーブル４０は、その先端を上記被分岐ケーブルの第１補助接続部ｆ上に位置されるように整列させ、上記第１分岐接続部ｅ及び上記第１補助接続部ｆに相応する位置の分岐ケーブル４０外皮を除去して第２分岐接続部ｅ’及び第２補助接続部ｆ’を形成する。したがって、第２補助接続部ｆ’側には分岐ケーブルの第１被分岐心線６０ａと接続できる分岐心線の先端が位置する。
【００４０】
そして、図１４ｂに示すように、分岐ケーブル４０の第２分岐接続部ｆ’側に位置した分岐心線の一部を第２分岐接続部ｅ’側に引き出す。ここで、上記引き出された部分は、第２分岐心線４０ｂであり、引き出されなくて残っている部分は、第１分岐心線４０ａである。したがって、分岐ケーブル４０の第１分岐心線４０ａは、その先端が第２補助接続部ｆ’側に位置するように形成され、分岐ケーブル４０の第２分岐心線４０ｂは、その先端が第２分岐接続部ｅ’側に形成される。一方、第１補助接続部ｆ側から第１被分岐心線６０ａを引っ張り出して、第１分岐接続部ｅから第１補助接続部ｆ側に引き出す。
【００４１】
次いで、図１５ａ及び図１５ｂに示すように、作業者は、上記分岐ケーブル４０の第２分岐接続部ｅ’で露出されている第１分岐心線４０ａ及び被分岐ユニット２０ａ内の未分岐心線７０をユニットらせん８０で被せて保護し、上記第２分岐心線４０ｂの所定部位は、保護チューブ１０で被せて保護する。
【００４２】
次いで、上記第１分岐接続部ｅと第１補助接続部ｆとにトレー１１、１２を各々取り付けるが、第１分岐接続部ｅのトレー１１内には第２被分岐心線６０ｂ及び第２分岐心線４０ｂを巻いて整理し、第１補助接続部ｆのトレー１２内には、第１被分岐心線６０ａ及び端部が第１補助接続部ｆに位置する第１分岐心線４０ａを巻いて整理する（図１５ｂ参照）。これによって、第１分岐接続部ｅ及び第１補助接続部ｆでそれぞれの接続ボックス１３、１４を利用して被分岐ケーブル２０、分岐ケーブル４０を結合することによって、被分岐ケーブル２０の接続余長を追加に確保しなくても容易に中間分岐接続を実施できることになる（図１５ｃ参照）。
【００４３】
さらに、本実施例で、光ファイバ心線ユニット単位に分岐する場合には、図１６ａに示すように、外皮剥ぎ取り地点間の被分岐ユニット２０ａ間に未分岐心線が残っていないため、ユニットらせんによる未分岐心線の保護作業なしに第１被分岐心線６０ａ全部を引っ張り出して第１補助接続部ｆ側に引き出す。
【００４４】
一方、分岐ケーブル４０は、その先端を上記被分岐ケーブルの第１補助接続部ｆ上に位置されるように整列させ、上記第１分岐接続部ｅ及び上記第１補助接続部ｆに相応する位置の分岐ケーブル４０外皮を除去して第２分岐接続部ｅ’及び第２補助接続部ｆ’を形成する。したがって、第２補助接続部ｆ’側には、分岐ケーブルの第１被分岐心線６０ａと接続できる分岐心線の先端が位置する。
【００４５】
そして、分岐ケーブル４０の第２分岐接続部ｆ’側に位置する分岐心線の一部を第２分岐接続部ｅ’側に引き出す。ここで、上記引き出された部分は、第２分岐心線４０ｂであり、引き出されなくて残っている部分は、第１分岐心線４０ａである。したがって、分岐ケーブル４０の第１分岐心線４０ａは、その先端が第２補助接続部ｆ’側に位置するように形成され、分岐ケーブル４０の第２分岐心線４０ｂは、その先端が第２分岐接続部ｅ’側に形成される。
【００４６】
ここで、第１分岐心線４０ａは、ユニットらせん８０で被せて保護する。この場合、被分岐心線６０ａ、６０ｂ及び分岐心線４０ａ、４０ｂは、図１６ｂのように、光ファイバ心線ユニット単位分岐での第１分岐接続部ｅ及び第１補助接続部ｆのトレー１１、１２内に整理される。
【００４７】
上記のように、分岐ケーブル４０の片側の外皮を除去して第１分岐接続部ｅと第１補助接続部ｆとを連結することによって、中間分岐接続を遂行する場合には、図１７に示すように、中間分岐接続ボックス１３と補助接続ボックス１４とが被分岐ケーブル２０と一直線上にあることになり、分岐ケーブル４０は、中間分岐接続ボックス１３内に収容され、中間分岐接続ボックス１３と補助接続ボックス１４との間には被分岐ケーブル２０及び分岐ケーブル４０で連結される。
【００４８】
上記のような本発明の中間分岐接続方法を光線路網のループ配線やスター配線で光ケーブルの分岐接続に使用する場合には、従来の方法のように被分岐ケーブルの接続余長を確保しなくて、分岐ケーブルの光ファイバ心線をループ配線の形態で容易に接続することができ、接続後の溝内で中間分岐接続点と被分岐及び分岐ケーブルの整理状態が簡単になる。また、今後本発明の中間分岐接続点で追加分岐が発生しても第１分岐接続部と第１補助接続部に設置されたそれぞれの接続ボックスカバーを開いて被分岐心線のみを引き出して分岐ケーブルの分岐心線と接続させることによって分岐作業が效率的にできる。
【００４９】
以上で説明した本発明は、前述した実施例及び図面により限定されるものではなく、本発明の技術的思想を抜け出さない範囲内で種々の置換、変形及び変更が可能であることは、当業者において明白である。
【００５０】
【発明の効果】
上記したように、本発明は、光ケーブル新設や運用に際して、分岐予想地点を考慮しないため、ケーブル配線計画が容易にでき、余長確保にともなうケーブル増設費用を節減でき、許容曲率半径以上に維持しなければならないケーブル整理作業にともなうケーブルの信頼度を高めることのできる効果がある。
【００５１】
そして、本発明は、溝でや電柱上に設置された被分岐ケーブルがケーブル進行方向と一直線上で整理されるため、ケーブル管理が易しいだけでなく電柱上で美観を損なわなくてケーブルを設置することができることに他の効果がある。
【００５２】
また、本発明は、光線路網の構築において、光ケーブル施設費用を低減し、分岐発生収容を容易に吸収でき、施設管理的な側面からの作業性を高めることができる効果がある。
【図面の簡単な説明】
【図１】図１ａ及び図１ｂは、一般的な光線路網の配線法を示す構成図である。
【図２】図２ａ及び図２ｂは、従来技術に係る光ファイバケーブルの中間分岐接続方法を示す一実施例図である。
【図３】図２ａの中間分岐接続溝から接続点分岐のための分岐光ファイバケーブルの布設状態図である。
【図４】本発明に係る光ファイバケーブルの中間分岐接続方法で一直線上に位置された中間分岐接続位置を示す構成図である。
【図５】本発明に係る光ファイバケーブルの中間分岐接続方法で、被分岐光ファイバ心線の引き出しのための光ファイバケーブル外皮除去位置表示図である。
【図６】図６ａ〜図６ｃは、本発明に係る光ファイバケーブルの中間分岐接続方法の第１実施例図である。
【図７】図７ａ〜図７ｃは、本発明に係る光ファイバケーブルの中間分岐接続方法の第１実施例図である。
【図８】図８ａ〜図８ｃは、本発明に係る光ファイバケーブルの中間分岐接続方法の第１実施例図である。
【図９】本発明の第１実施例による中間分岐接続完了後の被分岐及び分岐光ケーブルに対する整理状態図である。
【図１０】図１０ａ〜図１０ｂは、本発明に係る光ファイバケーブルの中間分岐接続方法の第２実施例図である。
【図１１】図１１ａ〜図１１ｃは、本発明に係る光ファイバケーブルの中間分岐接続方法の第２実施例図である。
【図１２】図１２ａ〜図１２ｂは、本発明に係る光ファイバケーブルの中間分岐接続方法の第２実施例図である。
【図１３】本発明の第２実施例による中間分岐接続完了後の被分岐及び分岐光ケーブルに対する整理状態図である。
【図１４】図１４ａ〜図１４ｂは、本発明に係る光ファイバケーブルの中間分岐接続方法の第３実施例図である。
【図１５】図１５ａ〜図１５ｃは、本発明に係る光ファイバケーブルの中間分岐接続方法の第３実施例図である。
【図１６】図１６ａ〜図１６ｂは、本発明に係る光ファイバケーブルの中間分岐接続方法の第３実施例図である。
【図１７】本発明の第３実施例による中間分岐接続完了後の被分岐及び分岐光ケーブルに対する整理状態図である。
【符号の説明】
１０管路
２０被分岐光ファイバケーブル
３０ケーブル支持台
４０分岐ケーブル
５０接続部
６０被分岐心線
７０未分岐心線
８０ユニットらせん
ａ溝
ｅ第１分岐接続部
ｆ第１補助接続部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an intermediate branch connection method of an optical fiber cable for branching a small-fiber cable at an intermediate point of an optical fiber cable section to which a loop wiring type or a star wiring type is applied in a configuration of an optical line network. In order to pull out only the branch core wire, an intermediate branch connection portion and an intermediate branch auxiliary connection portion are embodied, so that the intermediate branch connection can be performed without separately securing a connection surplus length of the branch cable. The present invention relates to an intermediate branch connection method for an optical fiber cable.
[0002]
[Prior art]
In general, an optical line network is configured in a loop wiring type, a star wiring type, or the like in consideration of diversification of services and adaptability to quantitative changes in services, reliability of equipment, economy, and the like. As shown in FIG. 1a, when a new cable is installed, the mold secures in advance a cable extra length for branch connection on a groove or a telephone pole 1, 2, 3, 4, 5, 6 where a branch is expected, If there is a demand for the core wire during operation, a branch cable is installed from the point where the demand for the core wire occurs to the branch point of the loop wiring network, and the optical fiber to be branched in the branch cable constituted by the loop wiring network is installed. A loop-type optical network is constructed by connecting only the wires (hereinafter referred to as “branched core wires”) to the left and right directions with the branch optical fiber core wires (hereinafter “branched core wires”) of the branch cable. I do.
[0003]
In addition, as shown in FIG. 1B, when a new optical fiber cable is installed, an expected branch point is selected. If the core wire demand is generated during operation, a branch cable is installed from the point where the core wire demand is generated to the branch point of the star wiring network, and the branched cable constituted by the star network is installed. A star-shaped optical line network is constructed by connecting only the to-be-split core wires to the fork core wires.
[0004]
In the construction of the optical line network as described above, the branch to the point where the core wire demand is generated is a branch point connection that branches and connects at a connection point of a cable constituting each line network, and a cable that is not a connection point. There is an intermediate branch connection that branches and connects at an intermediate point.
[0005]
On the other hand, at the time of interconnection between the optical fiber cores, tension is not directly applied to the optical fiber connection portion, and connection is made from the connection portion according to a connection failure, failure, or reconnection request due to operational necessity. In order to secure the minimum length of the optical fiber cable in order to secure the distance to the apparatus, in the intermediate branch connection, the extra connection length for the branch connection should be secured.
[0006]
As described above, in the prior art intermediate branch connection method for an optical fiber cable that requires an extra connection length, as shown in FIG. After the cable 20 is pulled out and supported by the cable support table 30, a loop is formed to secure an extra length. In this case, the branch optical fiber cable 40 connected to the core of the branch optical fiber cable 20 is located in the groove a. Then, as shown in FIG. 2B, after the cable having the extra connection length is fixed to the cable support portion 30a, and the stripping points are displayed on both sides of the loop portion, the stripping is performed so that the optical fiber is pulled out. The intermediate branch connection c is formed by removing the outer sheath of the cable in the take-out point. A connection box is attached to the portion where the outer skin has been removed.
[0007]
On the other hand, if the extra length of the cable cannot be secured or the extra length of the cable cannot be secured in the groove where the demand for the intermediate branch connection has occurred, the branch cable 40 is connected to the intermediate branch connection groove a as shown in FIG. A connection point branch connection is established in which the connection portion 50 is disassembled and the branch cable 40 is branched from the branch target cable 20 by laying the connection point branch groove b. In this case, a branch optical fiber cable of up to about 500 m must be added for branching at a connection point.
[0008]
However, in the conventional method of connecting and branching optical fiber cables as described above, the following various types of optical cable facilities for efficient construction of an optical line network are required in terms of economy, operability, workability, and the like. A problem has occurred.
[0009]
First, when a new optical cable is installed, the operator is unable to select the expected branch point accurately, resulting in an excessive cable length, or a shortage of the cable length secured for the intermediate branch connection. Since the branch cable should be laid down to the cable connection point in the loop or star wiring section, the cost is excessively increased by the additional cable.
[0010]
Second, if the worker selects the expected branch point incorrectly, either solve the excess length secured in the optical line section and pull it out to the point where the intermediate branch is generated, or connect the branch cable to the branch connection extra length. Since it should be laid up to the secured place, the cost associated with the laying will be added.
[0011]
Third, at the point where the intermediate branch occurs, the reserved extra connection length should be set to a length that allows the unbranched core wire to be accommodated in the connection box, so that the workability is low.
[0012]
Fourth, the outer sheath of the cable is cut in a horizontal direction and a vertical direction so that the unbranched core wire can be cut off at the intermediate branch connection portion without cutting the unbranched core wire as much as the secured extra connection length. This requires a considerable amount of time for the operation.
[0013]
Fifth, since the optical fiber core unit in which the unbranched core is accommodated by using hard PBTP (Polybutadiene Terephthalate) should be maintained in the connection box to have a bending radius equal to or larger than the allowable bending radius. It is difficult to arrange the fiber core units in the connection box, thereby reducing the reliability of the optical fiber core in the unbranched unit in which the operating optical fiber core is accommodated.
[0014]
Sixth, the extra connection length secured in the groove considerably complicates the interior of the groove, and the extra connection length secured on the utility pole not only impairs the appearance but also reduces the reliability of the cable.
[0015]
[Problems to be solved by the invention]
Therefore, the present invention has been proposed in order to solve the above-mentioned problems, and has been proposed. In the case of an intermediate branch connection, a straight-line cable having no loop portion (a state in which the cable has no extra length). It is an object of the present invention to provide an intermediate branch connection method for an optical fiber cable which provides a connection margin for a branch core.
[0016]
[Means for Solving the Problems]
In order to achieve the above object, the present invention relates to a method for connecting a branch cable to a straight branch optical fiber cable having no extra length, the method comprising the steps of: A first step of forming a first branch connection part and a first auxiliary connection part on both sides of the first skin maintenance part by removing each of the outer skins; A second step of forming one branch core and a second branch core, and a third step of connecting the first branch core and the first branch core with the branch connection part to form a connection part. A fourth step of pulling out the connecting portion to the auxiliary connection portion side; connecting the first branch core wire to the first branch core wire of the branch cable at the auxiliary connection portion; A fifth step of connecting the branch core to the second branch core of the branch cable. Providing an intermediate branch connection free fiber optic cables.
[0017]
The present invention also relates to a method for connecting a branch cable to a straight branch optical fiber cable having no extra length, wherein the branch cable has a predetermined length of outer skin at a predetermined interval. A first step of forming a first branch connection portion and a first auxiliary connection portion on both sides of the first outer skin maintaining portion by removing each of the first outer skin maintaining portions; A second step of forming a core wire and a second branch core wire, and a third step of drawing out the first branch core wire from the first sheath maintaining portion of the branch cable in the direction toward the first auxiliary connection portion A fourth step of installing a hollow body having a predetermined length on the auxiliary connection part side, and a fifth step of penetrating a branch core of the branch cable through the hollow body and positioning the branch core wire on the auxiliary connection part side. And a second branch at the first branch connection portion of the branch cable. A sixth step of connecting the branch core wires not penetrated by the hollow body in the fifth step, a first branch core wire at a first auxiliary connection portion of the branch target cable, and a fifth step. Connecting the branched optical fiber core wires penetrated through the hollow body to a seventh step.
[0018]
Further, the present invention provides a method for connecting a branch cable to a branch optical fiber cable having no extra length, wherein the outer cable having a predetermined length is removed at regular intervals by the branch cable. A first step of forming a first branch connection portion and a first auxiliary connection portion on both sides of the first outer skin maintaining portion; and cutting the branch target core wire at the first branch connection portion to form a first branch target core wire and a second branch connection core. A second step of forming a forked core, a third step of withdrawing the first forked core from the first sheath maintaining portion of the forked cable in a direction toward the first auxiliary connection portion, and the forked cable Are aligned so as to be located on the first auxiliary connection portion of the branched cable, and the first branch connection portion and the branch cable outer cover corresponding to the first auxiliary connection portion are removed to remove the second cable. A second branch connection part and a second branch connection part on both sides of the outer skin maintenance part; A fourth step of forming an auxiliary connection portion, a fifth step of drawing out a branch core wire from the second sheath maintaining portion of the branch cable in a direction toward the second branch connection portion, and a second branch of the branch cable A sixth step of connecting the core wire and the branch core wire drawn in the fourth step, and connecting the first branch target core wire and the branch optical fiber core wire on the second auxiliary connection portion side of the branch cable; And an intermediate branch connection method for an optical fiber cable.
[0019]
Hereinafter, an intermediate branch connection method for an optical fiber cable according to the present invention will be described in detail with reference to the accompanying drawings. Note that, among the components of the present invention, the same portions as the components of the prior art are denoted by the same reference numerals.
[0020]
First, in the present invention, as shown in FIGS. 4 and 5, after the branched cable 20 drawn into the conduit 10 in the intermediate branch connection point groove a is fixed to the cable support portion 30 a of the cable support base 30. The outer circumference of the first branch connection part e is removed by a length corresponding to the branch connection at the intermediate point of the branched cable 20 on the straight line, and a first auxiliary connection for auxiliary connection is provided on one side of the first branch connection part e. A connection portion f is provided. In the first auxiliary connection portion f, the outer skin is removed as much as the length of the auxiliary connection box. As described above, the step of removing the outer skin at the first branch connection part e and the first auxiliary connection part f is a step commonly included in all the embodiments described below.
[0021]
Here, it is natural that the lengths of the first branch connection portion e and the first auxiliary connection portion f are not longer than the lengths of the branch connection box and the auxiliary connection box accommodating these connection portions. The distance between the first branch connection part e and the first auxiliary connection part f is restricted by the space in the intermediate branch connection point groove a into which the branched cable 20 is drawn. Preferably, the length of the first auxiliary connection part f is about 25 cm to about 30 cm, and the length of the first branch connection part e is about 50 cm to about 60 cm. The first branch connection part e and the first auxiliary connection The distance between the portions f is most preferably about 25 cm to about 30 cm.
[0022]
In the first embodiment of the present invention, first, in order to enable the intermediate branch connection of the loop wiring method using a method of sending the branch core of the branch cable to the first auxiliary connection portion at the first branch connection portion, FIG. As shown in FIG. 6A, the first branch connection part e and the first auxiliary connection part f formed in one section of the first branch connection part e are stripped of the outer skin corresponding to the length of each connection box. Here, the length of the first auxiliary connection part f is preferably about 25 cm to about 30 cm, and the length of the first branch connection part e is preferably about 50 cm to about 60 cm. As described above, the distance between one auxiliary connection part f is most preferably about 25 cm to about 30 cm. Then, a predetermined portion is cut from the core of the branch optical fiber unit (hereinafter, referred to as “branch unit”) 20a of the first branch connection unit e. In this case, the cut portion is the branched core wire 60, and the remaining portion is the unbranched core wire 70.
[0023]
As a result, as shown in FIG. 6B, the forked core wire 60 is composed of the first forked core wire 60a on the auxiliary connection portion side and the second forked core wire located on the opposite side of the first auxiliary connection portion. 60b. Here, the operator pulls out the branch core composed of the first branch core and the second branch core 40a, 40b from the branch cable 40 located on the first branch connection part side, and then pulls out the first cover. The temporary core g is formed by connecting the branch core 60a and the first branch core 40a.
[0024]
Next, when the first branch core wire 60a is pulled out from the first auxiliary connection portion side, the first branch core wire 60a, the first branch core wire 40a, and the temporary connection portion g become auxiliary from the first branch connection portion side. The temporary connecting portion g is disassembled in a state where it is pulled out to the connecting portion side and the first branch cord 40a is drawn out to the auxiliary connecting portion side (FIGS. 6C and 6C).7areference).
[0025]
Next, the worker covers and protects the unbranched core wire 70 of the branch target unit 20a with a unit spiral (spiral tube) 80 at the first branch connection portion and the first auxiliary connection portion (FIG.7b), The corresponding optical fiber core protection plates, that is, the trays 11 and 12 are respectively attached to the first branch connection portion and the first auxiliary connection portion, and then the second branch core is installed in the ray 11 of the first branch connection portion. The wire 60b, the second branch core 40b, and the extra first branch core 40a are wound and arranged so as to reduce the volume, and the first branch core 60a and the first branch core 60a are arranged in the tray 12 of the first auxiliary connection portion. Wrap and arrange the branch core wire 40a (Fig.7creference).
[0026]
In this case, the first branch connection portion and the first auxiliary connection portion8aAs shown in (1), by connecting the branch cable 20 and the branch cable 40 to the respective connection boxes 13 and 14, the intermediate branch connection can be easily performed without securing an extra connection length.
[0027]
Furthermore, the figure8bIn the case of branching in units of the optical fiber core unit as in the above, there is no unbranched core wire between the branch target units 20a between the outer sheath cutting points, and thus no protection work of the unbranched core wire by the unit spiral 80 is performed. After temporarily connecting the first branch core wire 60a and the first branch core wire 40a cut at the first branch connection portion to form a temporary connection portion, the first branch connection core side at the first auxiliary connection portion side. By pulling out the wire 60a, the first branch core wire 40a of the first branch connection portion can be drawn out to the first auxiliary connection portion via the branch target unit 20a. The trays 11 and 12 of the first branch connection portion and the first auxiliary connection portion in the unit branch of the optical fiber core unit as described above include diagrams.8cThe first and second branched core wires 60a and 60b and the first and second branched core wires 40a and 40b are arranged as shown in FIG.
[0028]
After the intermediate branch is performed by the method described above, an intermediate branch connection point is provided in a groove or a utility pole.9As shown in FIG. 7, the intermediate branch connection between the first branch connection part and the first auxiliary connection part by the branch core cable connecting method utilizing the unit 20a of the branched cable 20 results in the intermediate branch connection box 13 and The auxiliary connection box 14 is aligned with the branched cable 20, and the branch cable 40 is accommodated in the intermediate branch connection box 13.
[0029]
On the other hand, according to the second embodiment of the present invention, when it is difficult to send the branch core wire to the first auxiliary connection portion by using the unit to be branched at the first branch connection portion, FIG.10a~ Figure12bAs shown in (1), by connecting the first branch connection portion and the first auxiliary connection portion using a separate tube cable, the branch core wire can be easily installed in the first auxiliary connection portion. did.
[0030]
In this embodiment, first,10aAs shown in (1), the first branch connection part e and the first auxiliary connection part f remove the outer skin of a length corresponding to each connection box, and remove a predetermined portion from the branch target unit 20a of the first branch connection part e. Disconnect. Here, the length of the first auxiliary connection part f is preferably about 25 cm to about 30 cm, and the length of the first branch connection part e is preferably about 50 cm to about 60 cm. As described above, the distance between the auxiliary connection portions f is most preferably about 25 cm to about 30 cm. Further, the cut portion is the branch core wire 60, and the remaining portion without being cut is the unbranched core wire 70. The branch core 60 is divided into a first branch core 60a on the first auxiliary connection part f side and a second branch core (60b) on the first branch connection part e side.
[0031]
Next, after the first and second branch cores including the first and second branch cores 40a and 40b are extracted from the branch cable 40 located on one side of the first branch connection e, the first branch connection e is connected to the first auxiliary connection. A tube cable 15 having a predetermined length is provided between the tube cable 15 and the portion f (FIG.10breference).
[0032]
Next, the worker11aAs shown in (1), after the first branched core wire 60a is pulled out toward the first auxiliary connection portion f side so that the first branched core wire 60a is located on the first auxiliary connection portion f side, The first branch core 40a of the branch cable 40 is protected by the unit helix 80 and drawn into the tube cable 15 so that its end is located on the first auxiliary connection side. The unbranched core in the branched unit 20a is covered and protected by the unit helix 80, and a predetermined portion of the second branch core 40b is covered and protected by the protective tube 10.
[0033]
Next, the trays 11 and 12 are respectively attached to the first branch connection portion and the first auxiliary connection portion, and the second branch core wire 60b and the second branch core wire 40b are provided in the tray 11 of the first branch connection portion. Are wound and arranged, and the first branch core wire 60a and the first branch core wire 40a drawn in from the tube cable 15 are wound and arranged in the tray 12 of the first auxiliary connection portion (FIG.11breference). As a result, the branching cable 20, the branching cable 40, and the tube cable 15 are connected to each other at the first branch connection portion and the first auxiliary connection portion by using the respective connection boxes 13 and 14, thereby connecting the branching cable 20. The intermediate branch connection can be easily performed without securing extra length.11creference).
[0034]
Furthermore, in the case of branching into optical fiber core units in this embodiment,12aAs shown in (1), since no unbranched core wire remains between the branched units 20a between the skin stripping points, the entire first branched core wire 60a is pulled without the work of protecting the unbranched core wire by the unit helix. In the branch cable 40 on the first branch connection part side, the entire first branch core wire 40a is covered and protected by the unit spiral 80 and drawn into the tube cable 15 to be pulled out to the auxiliary connection part side. Will be sent to In this case, the first and second branched core wires 60a and 60b and the branch core wires 40a and 40b12bAs described above, the optical fibers are arranged in the trays 11 and 12 of the first branch connection portion and the first auxiliary connection portion in the unit branch of the optical fiber core unit.
[0035]
As described above, when the intermediate branch connection is performed between the first branch connection part and the first auxiliary connection part by the branch core wire connecting method using the tube cable, FIG.ThirteenAs shown in the figure, the intermediate branch connection box 13 and the auxiliary connection box 14 are aligned with the cable 20 to be branched, and the branch cable 40 is housed in the intermediate branch connection box 13. The branch connection box 13 and the auxiliary connection box 14 are connected by a branched cable 20 and a tube cable 15.
[0036]
Figure14a~ Figure16bAs a drawing for explaining a third embodiment of the intermediate branch connection method for an optical fiber cable according to the present invention, as shown in the drawing, an intermediate branch connection method using the tube cable 15 of the second embodiment is described. Unlike the above, a separate tube cable 15 is not prepared, and the outer sheath on one side of the branch cable 40 is removed, and the first branch connection portion e and the first auxiliary connection portion f of the branch target cable 20 are connected to branch. The core wire can be easily installed at the auxiliary connection part f.
[0037]
Hereinafter, for convenience of description, the branch connection portion and the auxiliary connection portion formed in the branch cable 40 are defined as a second branch connection portion and a second auxiliary connection portion, respectively, and the branch connection formed in the branch target cable 20 is defined. The part and the auxiliary connection are defined as a first branch connection and a first auxiliary connection, respectively, as previously defined.
[0038]
In this embodiment, first,14aAs shown in the figure, the first branch connection part e and the first auxiliary connection part f of the branch target cable 20 remove the outer shells corresponding to the lengths of the respective connection boxes, and the branch target unit 20a of the first branch connection part e. Cut a predetermined part from. Here, the length of the first auxiliary connection part f is preferably about 25 cm to about 30 cm, and the length of the first branch connection part e is preferably about 50 cm to about 60 cm. As described above, the distance from one auxiliary connection part f is most preferably about 25 cm to about 30 cm. In addition, the cut portion is the branched core wire 60, and the remaining portion without being cut is the unbranched core wire 70. The branched core 60 is divided into a first branched core 60a on the first auxiliary connection part f side and a second branched core 60b on the first branch connection part e side.
[0039]
On the other hand, the branch cable 40 is aligned so that its tip is located on the first auxiliary connection part f of the branch target cable, and has a position corresponding to the first branch connection part e and the first auxiliary connection part f. Of the branch cable 40 is removed to form a second branch connection portion e ′ and a second auxiliary connection portion f ′. Therefore, the tip of the branch core wire that can be connected to the first branch core wire 60a of the branch cable is located on the second auxiliary connection part f 'side.
[0040]
And figure14bAs shown in (2), a part of the branch cord located on the side of the second branch connection portion f 'of the branch cable 40 is drawn out to the second branch connection portion e' side. Here, the extracted part is the second branch core 40b, and the part that is not extracted and remains is the first branch core 40a. Therefore, the first branch core 40a of the branch cable 40 is formed such that its tip is located on the second auxiliary connection part f 'side, and the second branch core 40b of the branch cable 40 has the tip It is formed on the branch connection part e 'side. On the other hand, the first branched core wire 60a is pulled out from the first auxiliary connection portion f side, and is pulled out from the first branch connection portion e to the first auxiliary connection portion f side.
[0041]
Then figure15aAnd figure15bAs shown in the figure, the operator covers the first branch core 40a exposed at the second branch connection part e 'of the branch cable 40 and the unbranched core 70 in the branch target unit 20a with a unit spiral 80. A predetermined portion of the second branch core 40b is covered and protected by a protective tube 10.
[0042]
Next, the trays 11 and 12 are attached to the first branch connection part e and the first auxiliary connection part f, respectively, and the second branch core 60b and the second branch are provided in the tray 11 of the first branch connection part e. The core wire 40b is wound and arranged, and the first branch core wire 60a and the first branch core wire 40a whose end is located at the first auxiliary connection portion f are wound in the tray 12 of the first auxiliary connection portion f. And organize (Figure15breference). As a result, by connecting the branch cable 20 and the branch cable 40 by using the respective connection boxes 13 and 14 at the first branch connection part e and the first auxiliary connection part f, the extra connection length of the branch cable 20 is provided. The intermediate branch connection can be easily implemented without securing additional15creference).
[0043]
Further, in the present embodiment, when branching into optical fiber core units,16aAs shown in the figure, since there is no unbranched core wire between the branched units 20a between the skin stripping points, the entire first branched core wire 60a is pulled out without the work of protecting the unbranched core wire by the unit helix. To the first auxiliary connection portion f side.
[0044]
On the other hand, the branch cable 40 is aligned so that its tip is located on the first auxiliary connection part f of the branch target cable, and has a position corresponding to the first branch connection part e and the first auxiliary connection part f. Of the branch cable 40 is removed to form a second branch connection portion e ′ and a second auxiliary connection portion f ′. Therefore, on the side of the second auxiliary connection portion f ', the distal end of the branch cable that can be connected to the first branch cable 60a of the branch cable is located.
[0045]
Then, a part of the branch cord located on the side of the second branch connection portion f 'of the branch cable 40 is drawn out to the side of the second branch connection portion e'. Here, the extracted part is the second branch core 40b, and the part that is not extracted and remains is the first branch core 40a. Therefore, the first branch core 40a of the branch cable 40 is formed such that its tip is located on the second auxiliary connection part f 'side, and the second branch core 40b of the branch cable 40 has the tip It is formed on the branch connection part e 'side.
[0046]
Here, the first branch cord 40a is covered and protected by the unit spiral 80. In this case, the branch cords 60a and 60b and the branch cords 40a and 40b are16bAs shown in the above, the first branch connection part e and the first auxiliary connection part f in the optical fiber core unit branch are arranged in the trays 11 and 12.
[0047]
As described above, when the intermediate branch connection is performed by removing the outer sheath on one side of the branch cable 40 and connecting the first branch connection part e and the first auxiliary connection part f, FIG.17As shown in the figure, the intermediate branch connection box 13 and the auxiliary connection box 14 are aligned with the cable to be branched 20, and the branch cable 40 is accommodated in the intermediate branch connection box 13 and the intermediate branch connection box 13 And the auxiliary connection box 14 are connected by a branched cable 20 and a branch cable 40.
[0048]
When the intermediate branch connection method of the present invention as described above is used for branch connection of an optical cable in a loop wiring or a star wiring of an optical line network, it is necessary to secure the extra connection length of the branched cable as in the conventional method. Thus, the optical fibers of the branch cable can be easily connected in the form of loop wiring, and the arrangement of the intermediate branch connection point, the branch target, and the branch cable in the groove after the connection is simplified. Further, even if an additional branch occurs at the intermediate branch connection point of the present invention in the future, the respective connection box covers provided on the first branch connection portion and the first auxiliary connection portion are opened, and only the branch core is pulled out to branch. By connecting to the branch core of the cable, the branching work can be performed efficiently.
[0049]
The present invention described above is not limited to the above-described embodiments and drawings, and it is understood by those skilled in the art that various substitutions, modifications, and changes can be made without departing from the technical idea of the present invention. Is evident in
[0050]
【The invention's effect】
As described above, the present invention does not consider the expected branch point in the construction and operation of the optical cable, so that the cable wiring plan can be easily made, the cost of increasing the cable due to securing the extra length can be reduced, and the cable can be maintained at an allowable radius of curvature or more. There is an effect that the reliability of the cable can be enhanced in the cable management work that must be performed.
[0051]
Further, according to the present invention, since the branched cables installed in the groove or on the telephone pole are arranged in a straight line with the cable traveling direction, not only the cable management is easy but also the cable is installed on the telephone pole without spoiling the appearance. What you can do has other effects.
[0052]
Further, the present invention has the effects of reducing the cost of an optical cable facility, easily absorbing the occurrence of branching, and improving the workability in terms of facility management in the construction of an optical line network.
[Brief description of the drawings]
FIGS. 1A and 1B are configuration diagrams illustrating a wiring method of a general optical line network. FIG.
FIGS. 2A and 2B are diagrams illustrating an example of an intermediate branch connection method of an optical fiber cable according to the related art.
FIG. 3 is a view showing the state of installation of a branch optical fiber cable for branching a connection point from the intermediate branch connection groove of FIG. 2A;
FIG. 4 is a configuration diagram showing an intermediate branch connection position located on a straight line in the optical fiber cable intermediate branch connection method according to the present invention.
FIG. 5 is a view showing an optical fiber cable sheath removal position for drawing out an optical fiber cable to be branched in the optical fiber cable intermediate branch connection method according to the present invention.
6a to 6c is the second method of the intermediate branch connection method for an optical fiber cable according to the present invention. 1 It is an Example figure.
FIG. 7FIGS. 7A to 7C show a second embodiment of the intermediate branch connection method for an optical fiber cable according to the present invention. 1 It is an Example figure.
FIG. 8FIGS. 8A to 8C show a second embodiment of the intermediate branch connection method for an optical fiber cable according to the present invention. 1 It is an Example figure.
FIG. 9The present invention 1 FIG. 6 is a diagram illustrating a rearrangement state of the branched and branched optical cables after the completion of the intermediate branch connection according to the embodiment.
FIG. 10FIGS. 10A and 10B show a second embodiment of the intermediate branch connection method for an optical fiber cable according to the present invention. 2 It is an Example figure.
FIG. 11FIGS. 11A to 11C show a second embodiment of the method for connecting an intermediate branch of an optical fiber cable according to the present invention. 2 It is an Example figure.
FIGS. 12a and 12b are diagrams illustrating a method for connecting an intermediate branch of an optical fiber cable according to the present invention; 2 It is an Example figure.
FIG. 13 of the present invention. 2 FIG. 6 is a diagram illustrating a rearrangement state of the branched and branched optical cables after the completion of the intermediate branch connection according to the embodiment.
FIGS. 14a and 14b show an optical fiber cable according to the present invention. Intermediate branch connection method 3 It is an Example figure.
FIGS. 15a to 15c are diagrams illustrating a method for connecting an intermediate branch of an optical fiber cable according to the present invention; 3 It is an Example figure.
FIGS. 16a and 16b are diagrams illustrating a method of connecting an intermediate branch of an optical fiber cable according to the present invention; 3 It is an Example figure.
FIG. 17 shows a second embodiment of the present invention; 3 FIG. 6 is a diagram illustrating a rearrangement state of the branched and branched optical cables after the completion of the intermediate branch connection according to the embodiment.
[Explanation of symbols]
10 pipeline
20 Branched optical fiber cable
30 Cable support
40 branch cable
50 Connection
60 forked core
70 unbranched core
80 unit spiral
a groove
e First branch connection
f First auxiliary connection

Claims

In a method for connecting a branch cable to a straight branch optical fiber cable having no extra length, a first length of outer sheath is removed at a constant interval by the branch optical fiber cable, and A first step of forming a first branch connection portion and a first auxiliary connection portion on both sides of the outer skin maintaining portion, and cutting the branch core wire in the branch optical fiber cable at the first branch connection portion to form a first branch. a second step of forming a target branch core wire and the second target branch core, and connects the first branch core wire of the first target branch core wire and within the branch cable in the first branch connection portion a third step of forming a connecting portion, the connecting portion to pull out to the first auxiliary connection side, and a fourth step of dismantling the connecting portion, the first target branch mind the first auxiliary connecting portion line was connected to the first branch core wire of the branch cable, the second object to be split by the first branch connection portion Intermediate branch connection method of an optical fiber cable comprising a fifth step, the to the core wire is connected to the second branch core in the branch cable.

The optical fiber cable according to claim 1, further comprising a sixth step of covering each of the unbranched core wires not cut in the second step with a protective covering material at the first branch connection portion and the first auxiliary connection portion. Intermediate branch connection method.

Upon cleavage of the target branch core at the second step, the length of the second object branch core wire length of the first target branch cores in the first branch connection portion is in the first branch connection portion 2. The method according to claim 1, wherein the optical fiber cable is cut so as to be substantially the same.

The length between the first outer skin sustain portion and the first auxiliary connecting portions are each about 25cm~ about 30 cm, the length of the first branch connection portion includes a feature to be about 50cm~ about 60cm 2. The intermediate branch connection method for an optical fiber cable according to claim 1, wherein:

The first respectively comprising a tray branch connection portion and the first auxiliary connecting portion, said within the respective tray first target branch core wire, the second target branch core, the first branch core, and the intermediate branch connection method for an optical fiber cable according to any one of claims 1 to 4, further comprising a seventh step of storing wound a second branch conductor.

In a method for connecting a branch cable to a straight branch optical fiber cable having no extra length, in the above-described branch optical fiber cable, a predetermined length of outer skin is removed at regular intervals. A first step of forming a first branch connection portion and a first auxiliary connection portion on both sides of the first outer skin maintaining portion, and cutting the branch core wire in the branch optical fiber cable at the first branch connection portion the first and second step of forming a target branch core wire and the second target branch core, the direction of the first auxiliary connecting portion side from the first outer skin maintain part of the object branch cable first target branch heart a third step of pulling out the line, the fourth step of installing the first auxiliary connecting portion a predetermined length on the side of the hollow body, said branches branch cores in the cable by penetrating to the hollow body of the first A fifth step of positioning the optical fiber cable on the auxiliary connection side; A sixth step for connecting the table of the first branch connection portion at the branch cores which have not been through the above hollow body in the second target branch core and the fifth step, the first of said target branch cable and the first target branch core at the auxiliary connection portion, the seventh step and the intermediate branch connection method of an optical fiber cable comprising a connecting the branch core wire passing through in the said hollow body in the fifth step.

And the first branch connection portion side and the first auxiliary connecting portion side of the unbranched core wire was cut at the second step, the above said fifth the branch core wire passing through in the said hollow body in step a 7. The intermediate branch connection method for an optical fiber cable according to claim 6 , further comprising an eighth step of covering each of the one branch connection portions with a protective covering material.

Intermediate branch connection method for an optical fiber cable of claim 6, further comprising an eighth step of covering the first branch connection portion side of the branch core wire passing through in the said hollow body in the fifth step with a protective covering material.

During the the branch core cut in the second step, the length and substantially the second target branch core wire length of the first target branch cores in the first branch connection portion is in the first branch connection portion 7. The method for connecting an intermediate branch of an optical fiber cable according to claim 6 , wherein the optical fiber cable is cut so as to be substantially the same.

The method according to any one of claims 6 to 9 , wherein the hollow body is a tube.

The first respectively comprising a tray branch connection portion and the first auxiliary connecting portion, said within the respective tray first target branch core wire, the second target branch core, the first branch core, and the further comprising claim 1 0 intermediate branch connection method for an optical fiber cable according to a ninth step of storing wound a second branch conductor.

The length between the first outer skin sustain portion and the first auxiliary connecting portions are each about 25cm~ about 30 cm, the length of the first branch connection portion includes a feature to be about 50cm~ about 60cm claim 1 1 mid-span connection of an optical fiber cable according to.

In the method for connecting a branch cable to a branch optical fiber cable having no extra length, the method further comprises: removing a predetermined length of the skin at a predetermined interval with the branch optical fiber cable to maintain the first skin. A first step of forming a first branch connection portion and a first auxiliary connection portion on both sides of the first branch connection portion, and cutting the branch target core wire in the branch target optical fiber cable at the first branch connection portion to form a first branch branch a second step of forming a core wire and a second target branch core, from the first outer skin maintain part of the object branch optical fiber cable in the direction of the first auxiliary connecting portion side of the above first object branch core wire a third step of pulling out the tip of the branch cable are aligned so as to be positioned on the first auxiliary connection portion of the object branch optical fiber cable, corresponding to the first branch connection portion and the first auxiliary connecting portion Remove the branch cable sheath at the position where A fourth step of forming a second branch connection portion and the second auxiliary connecting portions on both sides of the holding section, from the second outer skin maintaining portion of the branch cable in the branch cable in the direction of the second branch joint portion a sixth step of connecting a fifth step of withdrawing the branch core, and the branch core wire drawn with the second target branch core and the fourth step of the subject branch optical fiber cable, the first object intermediate branch connection method of an optical fiber cable comprising a seventh step for connecting the second auxiliary connecting portion side of the branch core branch core and within said branch cable.

The and unbranched core wire of the first branch joint portion that has not been cut in the second step, each protective coating material to the branch core wire of the fifth was not drawn in step the second branch joint portion further comprising claims 1 to 3 intermediate branch connection method for an optical fiber cable according to an eighth step of covering the.

Intermediate branch connection method for an optical fiber cable of claim 1 3 further comprising an eighth step of covering the protective coating material to the branch core of the second branch joint portion which has not been drawn in the fifth step.

During the branch core cut by said second step, the first target branch length of core wire of the second object branch cores in the first branch joint portion length substantially in the first branch connection portion It claims 1 to 3 intermediate branch connection method for an optical fiber cable, wherein the cutting to be identical to the.

The first respectively comprising a tray branch connection portion and the first auxiliary connecting portion, said within the respective tray first target branch core wire, the second target branch core, the first branch core, and the intermediate branch connection method for an optical fiber cable according to any one of claims 1 3 to 1 6, further comprising a ninth step of storing wound a second branch conductor.

The length between the first outer skin sustain portion and the first auxiliary connecting portions are each about 25cm~ about 30 cm, the length of the first branch connection portion includes a feature to be about 50cm~ about 60cm 18. The method for connecting an intermediate branch of an optical fiber cable according to claim 17, wherein: